Pump



July E39 l943 A. RAPPL ET AL 3249023 PUMP Filed Aug. 2, 1959 2sheets-sheet 1v m M m Y m?. m

mmm www ulnbl 1 H m l, RC. NNW/h A.:

July l13, 1943. A. RAPPL ET A1. 2,324,023

PUMP y Filed Aug. 2, 1939 2 Sheets-Sheet 2 ATTORNEYS T Patented July134.943

PUMP

Anton Rappl, Buffalo, and Erwin C. Horton,

Hamburg, N.

Y., asllgnors to lrico Products Corporation, Buffalo. N. Y. ApplicationAugust 2, 1939, Serial No. 287,979

9 Claims. (Cl. 23o-159) 'I'his invention relates to pumps and hasparticular application in the automotive fleld as a source of suctionfor the operation of motor vehicle accessories, such as windshieldcleaners.

It has heretofore been proposed to provide a vane type fluid pump,utilizing the oscillating vane for the displacement of air or gaswherein the sliding contact of the vane-like piston on the chamber wallshas been sealedvby a lubricant. Practical experience has demonstratedthat in certain positions of the pump the sealing liquid is moreefficacious than in other positions.

The primary aim of the present invention is to provide a pump of thischaracter which is equally efficient under all circumstances, an objectof the invention being to provide improved means whereby the fluiddisplacing member may be effectively sealed by the sealing liquid. Theinvention further resides in certain salient features of construction bywhich the eillciency of the pump is greatly improved.

In the drawings:

Fig. 1 is an elevation of the improved pump;

Fig. 2 is a transverse vertical section therethrough;

Fig. 3 is a detailed elevation of the vane or fluid displacing memberwith one of the wear pads removed;

Fig. 4 is a fragmentary view of the pump with the cover plate removedand showing the modiiled embodiment of the invention; and

Fig. 5 is a longitudinal vertical section through the pump mechanism ascombined with the oil pump of a motor vehicle power plant.

Referring more particularly to the drawings, the numeral designates thecasing having a chamber 2 and a cover plate 3 secured to the casing bysuitable fasteners 4. The casing is provided with a nipple 5 forconnection to a suction operated accessory. The passage 6 through thenipple may be provided with a lter element B' and branch through valvedinlet ports leading to passageways 8 formed in the opposing side wallsof the chamber 2. Pivotally mounted within the chamber by a shaft 9 is auid displacing member in the form of a vane I which has its outer end ofarcuate form for wiping contact on the similarly shaped end wall I2 ofthe chamber. The vane is oscillated by a cam I3 `fixed on a drive shaftIl and operating within a second chamber I5, the latter being formedwithin the vane I0, so that as the cam is rotated the vane will beoscillated about its support 9. Hardened wear plates or pads i6 areprovided at the opposite sides of chamber I for being constantly wipedby the cam during its rotary movement. These wear plates are removablyitted within recesses Il in the side walls of the chamber I5 and areheld against displacement by their close fit with the periphery of thecam. The shaft 9 is received within a bearing I8 for relative pivotalaction, and the adjacent end of the varie is shaped concentrically as atI9 for sliding contact upon the adjacent end wall surface 20 of thechamber 2.

For discharging the displaced air or fluid from the chamber 2, thepiston is provided with a transversely arranged valve chamber whichopens through the opposite faces thereof and in which are disposed apair of valve discs 2| and an interposed spring 23, the latter servingto yieldably hold the valves outwardly in closed position against seatforming plates 22. These plates are conveniently secured in place byfastener elements 24 extending through the piston body. The valvechamber also opens into chamber I5 by channels 25 so that as the fluidis displaced from chamber 2 it will unseat alternately the.

valves 2| and pass into chamber i5 from whence it flows through achordal passage 26, provided in the cam I3, and into the axial bore 21formed in the shaft I4. Any air which passes entirely through thechordal passage 26 'and into the lower end portion of the cam chamber I5will merely surge back and forth, in a breathing manner, as the camenlarges and ensmalls the chamber portion.

For sealing the clearance between the piston and the walls of chamber 2a small quantity of sealing liquid, such as oil, is admitted through anaxial passage 28 provided in shaft 9 and discharges through a radialport 29 into the bearing I8 from whence the lubricant will ilow to theseveral sliding points of contact. For more effectively sealing theouter end of the piston a series of transverse grooves 30 arey formedtherein in opposition to the end wall surface I2 so as to collect andhold sufficient sealing liquid even though this portion of the pump maybe mounted in an upright position with the shaft 9 disposed in a lowerand horizontal plane.

To forestall the passage of air from one s'ide of the vane to theopposite side thereof between the wall surfaces I9 and 20, there isprovided a web 3| serving to close the space between the shaft 9 andsuch wall 20 so as to provide in effect an increasedpath about the shaft9. By reason of the presence of the sealing liquid this distorted pathwill effectively prevent the passage of air about the adjacent end ofthe piston. To

accommodate the web 3I the adjacent end of the piston is formed with asegmental opening 32 of sufficient size to permit the oscillatorymovement.

While the shaft I4, to which the cam is fixed, may be rotated in anydesired manner, there has been shown in Fig. 5 an arrangement by whichthe suction pump derives its power from the oil pump of a motor vehiclepower plant. In this illustration the lntermeshing gears 33 and 34,which constitute the pumping elements of the oil pump, are mounted onshafts 35 and 36, the latter being extended for operative connection tothe engine cam shaft. In this adaptation a special cover plate 31 willbe provided between the two pumps with an oil duct 38 delivering oilfrom the pressure side of the oil pump to the shaft passage 28 forsealing the suction pump. The cam shaft Il may be an integralcontinuation of the oil pump shaft 36.

In lieu of the oil grooves 30 a very thin :dat steel plate 39 may beinserted between the end walls II' and I2 so that the piston willsubstantially conform the plate to the curvature of the wall I2 Whilestill maintaining good contact with the end wall I I' of the piston.

In operation the cam I3 will the oil pump shaft to oscillate the pistonwithin the chamber 2. The sealing oil will be supplied to the duct 38through a small orifice 40 and will nd its way into the bearing I8 andother sliding contacts withinl the chamber 2. Air will be withdrawnthrough inlet opening 6 first through one valve to passage 1 and thenthe other, while the air in front of the piston will be dischargedthrough valve 2| and passage 25 into chamber I5, and thence through theshaft passage 21 which will be extended through the oil pumpl shaft 36for radial discharge through port 4I into the engine crank case. Withthe discharge of the air the spent sealing oil will also be expelled. Asthe sealing fluid enters the bearing I8 it will not only seal theclearance about the shaft 9 but also the clearance between wall surfacesI9 and so as to make it practically impossible for the fluid beingpumped to traverse the distorted path by reason of the web 3l, thelatter having preferably a mechanically tight flt with the shaft 9.While the oil grooves may be extended around the sides of the piston ifdesired, this has been found unnecessary in practical use.

While the invention has been described for use as a suction pump, -it isobvious that the same may be used as an air compressor or for thepumping of liquids. The detailed description has been given for the sakeof clearness since the inventive principles herein involved areobviously capable of assuming other physical embodiments withoutdeparting from the spirit or scope of the invention claimed.

What is claimed is:

1. A pump comprising a casing having a chamber with inlet and outletmeans, 'a shaft arranged in the chamber adjacent one wall thereof, a webextending between the wall and shaft and closing the space therebetween,a uid displacing member dividing the chamber into pumping compartmentsand having a bearing receiving the shaft, said bearing being formed witha segmental cut-out to straddle the shaft and extend on opposite sidesof the web with suicient clearance to permit oscillation of thedisplacing member, and means for oscillating the fluid displacingmember.

2. A pump comprising a casing having a be rotated fromy chamber withinlet and outlet means, a shaft arranged in the chamber ad] acent onewall thereof, a web extending between the wall and shaft and closing thespace therebetween, a uid displacing member dividing the chamber intopumping compartments and having a bearing receiving the shaft, saidbearing being formed with a seamental cut-out to straddle the shaft andextend on opposite sides of the web with sufficient clearance to permitoscillation of the displacing member, means for oscillating the fluiddisplacing member, and means for supplying the chamber with a sealingquantity of liquid, the end of the uid displacing member which is remotefrom said bearing being formed with a liquid holding recess forentrapping some of the seal-lng liquid.

3. A pump comprising a casing having a chamber with inlet and outletmeans, a shaft arranged in the chamber adjacent one wall thereof, a webextending between the wall and shaft and closing the space therebetween,a fluid displacing member dividing the chamber into pumping compartmentsand having a bearing receiving the shaft for oscillation of said fluiddisplacing member, said bearing being formed with a segmental cut-out tostraddle the shaft and extend on opposite sides of the web withsuflicient clearance to permit oscillation of the displacing member,means for supplying the bearing with a sealing quantity of liquid, athin packing plate interposed between the end of the uid displacingmember which is remote from said bearing and the adjacent end wall ofthe chamber opposite to the shaft and made to conform to said chamberwall by the member, said plate being retained in position by other wallportions of the chamber. and means for oscillating the uid displacingmember. l

4. A pump comprising a casing having a chamber with a shaft arrangedtherein adjacent one wall thereof, a relatively thin web extendingradially from the shaft to the wall with the shaft extending on oppositesides of the web, a fluid displacing member dividing the chamber intopumping compartments and having a bearing receiving the shaft foroscillation of the fluid displacin member, said bearing extending aboutthe shaft an extent greater than one-half the circumference of the shaftfor suspension support therefrom and being formed with a segmentalcut-out to straddle the shaft and extend on opposite sides of the webwith sufficient clearance to permit oscillation of the displacingmember, said uid displacing member being provided with an opening, a camjoutnaled in the casing and operating in the opening to oscillate saidmember, said cam being provided with an exhaust opening, and valvedinlet and outlet means for the 'casing cham-ber, the valved outlet meansbeing carried by the fluid displacing member and discharging into thecam vopening thereof for exhausting through the exhaust opening.

5. A pump comprising a casing having a chamber, a fluid displacingmember dividing the chamber into pump compartments and movable back andforth therein for displacing fluid rst from one side and then theopposite side thereof, said member having an opening therein extendingtransverse to the direction of movement of the fluid displacing member,and a cam journaled in the casing and rotatable in the opening of thefluid displacing member with the periphery of the cam being in drivingcontact with the opposite side walls of the opening, the cam having apassage opening through its periphery at points spaced with respect toeach other and communieating with a second passage therein coaxial withthe axis of rotation of the cam, a valve chamber in the fluid displacingmember communicating with the pump compartments and also with the camreceiving opening, valve means in said valve chamber, the pump havinginlet and outlet means, one of which inlet and outlet means includes theline of iiuid communication as provided by the valve chamber and the campassages.4

6. A pump comprising a casing having a chamber with inlet and outletmeans, a shaft arranged in the chamber adjacent onewall thereof, a iluiddisplacing member pivotally hung on the shaft and dividing the chamberinto two pumping compartments, the end of the member remote from thepivot having liquid sealed contact with the opposite chamber wall, saidmember having an opening therein extending transversely to the directionof movement of the iluid displacing member, and a cam journaled in thecasing and rotatable in the opening of the iluid displacing member withthe periphery of the cam being in driving contact with the opposite sidewalls of the opening, the cam having a passage opening through itsperiphery at points spaced with respect to each other and communicatingwith a second passage extending axially therethrough, said displacingmember having a valve chamber opening through the opposite sides thereofand formed with opposed seats, the passages in said cam and the valvechamber in said displacing member comprising said outlet means, a pairof valves within the valve chamber, and a spring interposed between thevalves to yieldably hold them to their seats, either valve beingunseated by a preponderance of iluid pressurein its adjacent pumpingcompartment, said valve chamber communicating with the cam receivingopening, said casing chamber being provided with an inlet passagecommunicating with the inlet means.

'1. A pump comprising a casing having a cham- I ber, a uid displacingmember dividing said chamber into pump compartments and oscillatabletherein for displacing fluid rst from one side and then the oppositeside thereof, said member having an opening therein extendingtransversely to the direction of movement of the fluid displacingmember, and a cam journaled in the casing and rotatable in the openingof the fluid displacing member with the periphery of the cam being indriving contact with opposite side walls of the opening, the cam havinga passage opening through its periphery at spaced points andcommunicating with a second passage extending axially thereof, a valvechamber in the fluid displacing member communicating with the pumpingcompartments at opposite sides thereof and also with the cam receivingopening, uni-directional valve means in said valve chamber permittingfluid flow in one direction only in the line of fluid communicationprovided by the valve chamber and the cam passages, the pump havinginlet and outlet means, one of which includes the line of iluidcommunication provided by the valve chamber and the cam passages.

8. A pump comprising a casing having a chamber with inlet and outletmeans, said chamber having opposed walls, a shaft arranged in thechamber adjacent one wall thereof, a fluid displacing member pivotallyhung on the shaft and dividing the chamber into two pumpingcompartments, the end of the member remote from the shaft having liquidsealed contact with the chamber wall which is in abutting relationtherewith, means independent of said shaft and engaging the fluiddisplacing member to oscillate the same, said member having a valvechamber opening through the opposite sides thereof and formed withopposed seats, a pair of valves within the valve chamber, and a springinterposed between the valves to yieldably hold them to their seats, anda uid passage in said uid displacing member oscillating means, saidvalve chamber being in communication with said iluid passage and formingwith the latter a part of one of said inlet and outlet means.

9. A pump comprising a casing having a chamber with inlet and outletmeans, a shaft arranged in the chamber adjacent one wall thereof, a webextending between the wall and shaft and closing the space therebetween,a uid displacing member dividing the chamber into pumping compartmentsand having a bearing receiving the shaft, vsaid bearing being formedwith a segmental cut-out to straddle the shaft with a iluid tight sealand extend on opposite sides of the web with sufficient clearance topermit oscillation of the displacing member, an end of the fluiddisplacing member contacting the wall portion of the chamber which isopposite to and remote from said shaft and being provided with a seriesof shallow transverse grooves facing said opposite wall for affordingfluid tight seal with such Wall of the chamber which is remote from saidshaft, and

means for oscillating the fluid displacing member.

ANTON RAPPL. ERWIN C. HORTON.

